Also how did you get these links?
Google the exact URL with quotes, and you'll find any number of sites that have them linked all over the place. DigitalRiver is MS's online sales partner, so the links are there for customers who purchase keys from them. I usually use Technet too, but these work. I think they are retail, but my OEM keys seem to work on them. I'm not even sure that the ISOs for Retail vs. OEM are even different, although I haven't checked the hashes.
For XP, MS even offers a product key update tool that switches licensing between Retail/OEM/VLK and vice-versa, so I wouldn't be surprised if 7 just works with anything.